Telephone



(N0 Model.) 2 Sheets-Sheet l.

H. W. LIBB'EY, TELEPHONE.

No. 526,865. Pai-,ema om. 2, 1894.

(No Model.) y 7 2 sheets-sheet 2.

' H. W.'LIBBEY.

TELEPHONE.

N. 526,865. i Patented 061;. 2, 1894.

@Umano STATES PATENT OFFICE.

HOSEA XV. LIBBEY, OF BOSTON, MASSACHUSETTS.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 526,865, dated October 2, 1894.

Application filed August 1, 1892.

To a/ZZ whom it, may concern:

Be it known that I, HOSEA. W. LIBBEY, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Telephones, of which the following, taken in connection with the accompanying drawings, is a specification.

The object of my invention is to produce a combined transmitter and receiver for tele,

phonic purposes whereby the human voice or other sounds produced at a distance from the\ instrument will be concentrated, transmitted and delivered so as to be audible to a person at a distance from the corresponding instrument at the other end of the line and vice versa.

The invention consists in certain details of constructions hereinafterfully described and pointed out in the claims.

Referring to the accompanying drawings: Figure 1 represents a vertical section of a resonant semi-globose sound receptacle or distributer embodying my invention. Figl 1ais a rear view of a portion of the same showing its formation to attach it to the stand. Fig. 2 is a side view of a combined transmitter and receiver embodying my invention. Fig. 3 is a plan or top view of the same. Fig. 4- is a transverse section taken on line m, of Fig. 2. Fig. 5 is a diagram showing the connection between two' such instruments. n

A, represents a resonant semi-globose sound receptacle or distributer, preferably/ formed of glass, and having an opening a, at. its rear end, the inner face being rounded on an easy curve a', to said opening so as to receive and emit sound without resistance. When it is desired to secure the receptacle and distributer to -a table, the rear portion of it may be provided with a projection as perforated ears a2 which can be pivotally secured to any desired base'or support.

B, is a disk or diaphragm secured a short distance from the rear of the receptacle distributer A, by a screw threaded ring C, the space D, between the receptacle A and the diaphragm forming an air chamber.

E, is a horse shoe magnet having a coil F, upon each of its poles.

Serial No. 441,786. (No model.) Y

G, is an armature having a central projection G', said armature being arranged in a box or case H, and supported by means-of pieces of 'cat gut, silk or other suitable material I, passed round the projecting piece G', and through the sidesof the box H, the end of said cat gut beingsecured to plates J,

through each of which is passed a thumbv screw K, the end of which has a bearing against a standard L, so that as the thumb screws K, are tightened up the cat gut will be stretched to its fullest extent and thus support the armature G, forming a spring support so that it (the armature) is free to vibrate laccording to the sound waves that are imparted thereto by the diaphragm B, or the horse shoe magnet E.

To the rear of the disk B, is secured a carbon button b, which is in contact with the armature, and to the armature opposite the poles of the magnet E, is secured carbon buttons g, which prevent contact with the mag-y net E, said buttons b, g, forming microphonicY contacts between the diaphragm B, armature HG, and the horse shoe magnet E.

The box or concentrating chamber H, is Yformed of hard rubber or othersuitable insulating materiah'and this box is lled with sponge or other suitable material which is preferably saturated with a weak solution of glycerine or any suitable material to maintain its elasticity and prevent it matting whereby the resistance of the armature G, is varied, the sponge acting as a spring force in the varied resistance when actuated by sou nd waves.

A battery L, at one end of the line is connected to one of the coils F, by a switch f which coil is connected to the coil F, on the other pole of the horse shoe magnet, said coil being connected by a live wire M connected to one of the coils F on the magnet at the yother end of the line, which connects with the 'coil F on the other pole, said coil being connected to the ground by the switch f. N; N,

are wires leading from the batteries L, L, to the ground. When it is desired to sendithe current in the opposite direction the positions of the switches f, are reversed.

The horse shoe magnets E, are each supported near their forward ends by resting IOO upon a frame Q, and at their rear ends are formed With a rack e on their under side which rack rests upon and Works in a cog wheel R, on shaft S, so that by adjusting the shaft S, the poles of the magnet may be brought nearer to or farther from the armature G.

Although I have shown and described the instrument as standing longitudinally to adapt it to rest upon a table or desk, it is obvious that if desired it might be supported so as to receive and deliver sounds over head.

What I claim isl. In a telephone, an armature arrangedbetween the poles of a horse shoe magnet, and the diaphragm, said armature being suspended by cat gut or silk cord as set forth.

2. In a telephone, a box or case inclosing an. armature arranged between the poles of a horse shoe magnet, and the diaphragm, said armature being suspended by cat` gut, and

surrounded by spon ge or its equivalent saturated or filled with a suitable material as set forth.

3. In a telephone the combination of a resonant semi-globcse sound receptacle or distributer A, diaphragm B, armature G, supported by cat gut or silk cord I, and adjustable horse shoe magnet E, substantially as set forth.

4. In a telephone, an armature having a central projection over which is passed cat gut or silk cord, for suspending the same, and which acts as a spring tension, and produces ne vibrations as set forth. In testimony whereof I have signed my name to this specification, in the presence of \two subscribing Witnesses, on this 29th day of April, A. D. 1892.

HOSEA W. LIBBEY.

Witnesses:

CHAs. STEERE,

EDWIN PLANTA. 

